行业组件数据 · 2026

自举电路

Bootstrap circuit for high-side MOSFET/IGBT gate driving in power converters

技术定义与适配语境
典型 自举电路 会按材料、尺寸公差、适配关系和失效风险在 电气设备制造 中评估。

A bootstrap circuit is an auxiliary power supply circuit used in gate drive circuits to provide floating voltage to the high-side switch in half-bridge or full-bridge configurations. It typically consists of a bootstrap capacitor, diode, and resistor, creating a temporary voltage source referenced to the switching node to drive the high-side gate when the low-side switch is conducting.

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组件规格

定义
A bootstrap circuit is an auxiliary power supply circuit used in gate drive circuits to provide floating voltage to the high-side switch in half-bridge or full-bridge configurations. It typically consists of a bootstrap capacitor, diode, and resistor, creating a temporary voltage source referenced to the switching node to drive the high-side gate when the low-side switch is conducting.
工作原理
When the low-side switch is turned on, the switching node voltage drops near ground, allowing the bootstrap capacitor to charge through the bootstrap diode from the low-voltage supply. When the low-side switch turns off and high-side needs to be driven, the charged capacitor provides floating gate drive voltage relative to the switching node, enabling proper high-side MOSFET/IGBT switching despite the floating reference.
材料
Ceramic capacitors (X7RX5R dielectric)fast recovery diodes (Schottky or ultra-fast silicon)PCB with appropriate creepage/clearancecopper traces
Voltage Rating
≥ (Vcc + Vmax + margin)
Operating Frequency
Up to 500kHz
Reverse Recovery Time
<50ns
Bootstrap Capacitor Value
0.1μF to 10μF
Bootstrap Diode Forward Current
1A to 3A
标准
IEC 61800UL 508IEC 60747

行业分类与别名

自举电路 的常用贸易名称、技术标识和检索关键词。

bootstrap circuitgate drive circuithigh-side driverMOSFET driverIGBT driverpower electronicsswitching power supply自举电路Bootstrap Circuit电气设备制造 自举电路

上级产品

该组件会出现在以下整机或工业产品中。

栅极驱动电路
用于控制功率转换系统中功率半导体器件（如IGBT或MOSFET）开关的电子电路。
查看产品详情 ->

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Bootstrap capacitor aging or degradation->Insufficient gate drive voltage causing high-side switch partial turn-on->Use high-reliability capacitors with derating, implement UVLO protection, periodic capacitance testing
Bootstrap diode thermal stress->Diode short circuit causing continuous capacitor discharge->Proper heatsinking, current derating, use of Schottky diodes with lower Vf

工业生态与工程逻辑

兼容对象
Half-bridge convertersFull-bridge convertersThree-phase invertersMotor drivesSwitching power supplies
可替换件
InfineonTexas InstrumentsON SemiconductorSTMicroelectronicsMicrochip
0
Capacitor discharge during extended high-side on-time
1
Diode reverse recovery causing voltage spikes
2
Insufficient creepage causing arcing
3
ESD damage to gate driver IC

合规与检测

tolerance
Capacitance: ±10% to ±20%, Voltage: +0%/-10% of rated voltage
test method
In-circuit testing of bootstrap voltage during operation, leakage current measurement, thermal cycling test per IEC 60068

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采购评估维度

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技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例，不代表真实客户评分、具体国家买家反馈或实时询盘。

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常见问题

What happens if the bootstrap capacitor discharges too much?

Insufficient bootstrap capacitor charge causes under-voltage lockout (UVLO) protection to trigger, preventing high-side switching and potentially causing shoot-through or improper operation.

How do I calculate bootstrap capacitor value?

Cboot = (Qg_total × N) / (ΔVboot - Vf - Vmin), where Qg_total is total gate charge, N is safety margin (2-3), ΔVboot is allowable voltage drop, Vf is diode forward drop, and Vmin is minimum required gate voltage.

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